Author Topic: Tardief's DRSSTC  (Read 7577 times)

Offline Tardief

  • High Voltage Enthusiast
  • *
  • Posts: 33
  • Karma: +0/-0
    • View Profile
Tardief's DRSSTC
« on: June 24, 2017, 11:07:31 PM »
Hi!
We are planning to build a DRSSTC with 4x CM600HA-24H. I have never built such a big coil, so I do not have much experience. I'm still learning and at the end of this project I want to understand everey single piece of it.  :D
I don't want to ruin a bunch of expensive things so if you could say a good/not good to my updates that would be very good.
Constructive criticism is MUCH appreciated.

#1




The  secondary diamater is fix. 315mm
What do you think?
« Last Edit: June 25, 2017, 01:48:18 PM by Tardief »

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1046
  • Karma: +16/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: Tardief's DRSSTC
« Reply #1 on: June 26, 2017, 12:50:19 PM »
I personally think you chose a too thin wire, thus getting many turns, higher impedance than what you really want in a huge Tesla coil like the one you are aiming for. I used 0.75 mm diameter wire for my DRSSTC3 (roughly AWG20), there are a wide range of values to use, simulate, calculate on and so on in the secondary part of my DRSSTC guide: http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/secondary-coil/

4x CM600 single modules will properly give you the same performance as my DRSSTC3, so design for a max of around 2 kA peak current and you can go higher if you feel adventurous, but do not make a MMC that can not handle at least 2 kA for a prolonged time, building such a large Tesla coil is both expensive and time consuming, so do not try to cut any corners that will risk damaging expensive parts later on.

What capacitors do you have in mind for the MMC?

If you have the money ready for it, get lucky on a good deal or want to try to solder a MMC for the DC link capacitor, see if you use polypropylene/MKP capacitors for the DC link smoothing instead of the old slow electrolytic capacitors, the performance boost is incredible from the much lower time to deliver current from storage through the IGBTs to the primary circuit.

edited: to correct wrong numbers on wire size
« Last Edit: June 26, 2017, 02:37:47 PM by Mads Barnkob »
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Tardief

  • High Voltage Enthusiast
  • *
  • Posts: 33
  • Karma: +0/-0
    • View Profile
Re: Tardief's DRSSTC
« Reply #2 on: June 26, 2017, 01:34:29 PM »
You sure that was 0.75mm2?
http://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-iii/
I thought the 0.75 is the diameter.
I choose that wire, because i cant fit enough turn with a thicker wire so the frequency would be too high.

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1046
  • Karma: +16/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: Tardief's DRSSTC
« Reply #3 on: June 26, 2017, 02:36:53 PM »
You sure that was 0.75mm2?
http://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-iii/
I thought the 0.75 is the diameter.
I choose that wire, because i cant fit enough turn with a thicker wire so the frequency would be too high.

You are absolutely right, I am sorry for that mistake, I have edited my reply so yours with quote here will be the changelog :)

Yes I used 0.75 mm diameter wire, 1800 turns, for a 1500 mm long winding.

I still think you should use AWG20, 1700 Turns, you should get around 40 kHz.

Have you made any decisions around my other questions?
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Tardief

  • High Voltage Enthusiast
  • *
  • Posts: 33
  • Karma: +0/-0
    • View Profile
Re: Tardief's DRSSTC
« Reply #4 on: June 26, 2017, 03:11:51 PM »
Not yet.
Still doing some research in that topic.
Maybe we will use one from here:
http://kaizerpowerelectronics.dk/theory/good-mmc-capacitors/ <--Thanks for that  :)

How can i end up at ~40kHz with that low turn number? Even with 1800 turn it will be 45kHz according to JavaTC. The surronding capacitance has so big influence?
« Last Edit: June 26, 2017, 03:14:21 PM by Tardief »

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1046
  • Karma: +16/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: Tardief's DRSSTC
« Reply #5 on: June 26, 2017, 03:59:34 PM »
For a MMC in a CM600 coil, look for large GTO snubber capacitors, they are in the range of 1-10uF, several kV, hundreds of ampere peak and high RMS current rating, but they will also cost you money :)

Surroundings matter a great deal to the resonant frequency, for a coil that big I calculated with 5 meter radius, that would be that I have no objects inside the strike radius of the coil.

This example with AWG20 gave me 43 kHz, I am sorry that you work in inches and I work in SI units ;)


http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Tardief

  • High Voltage Enthusiast
  • *
  • Posts: 33
  • Karma: +0/-0
    • View Profile
Re: Tardief's DRSSTC
« Reply #6 on: June 27, 2017, 04:14:45 PM »
Exactly, i prefer SI units. I'm from Hungary. I used inches because most of the coil builders used that and thought it would be more comfortable for them.

I thought it will be easier to find suitable capacitors. So far I have these options:

-http://hu.mouser.com/ProductDetail/Cornell-Dubilier-CDE/942C16P68K-F/?qs=sGAEpiMZZMv1cc3ydrPrF8gMTJ0uZsYN8XXe1MRhowk%3d
  10 in series and 6 in parallel. That's a lot.  :D

-http://www.tme.eu/hu/details/416.74.6030/standard-poliprop-folia-kondenzatorok/ducati-energia/

Offline futurist

  • Global Moderator
  • High Voltage Technician
  • *****
  • Posts: 116
  • Karma: +0/-0
    • View Profile
Re: Tardief's DRSSTC
« Reply #7 on: June 28, 2017, 10:52:52 AM »
Finding good and cheap MMC capacitors is the most difficult part in building DRSSTC

942Cs are not suitable for coil that big, even 10 in series may not be enough. Some coilers suggest watching only AC voltage rating of the MMC, which would be just 4600V for that MMC
Primary reactance is Xc = 1/ 2pi*f*C, multiply it by the peak current you'll be running your coil at to get your peak voltage

Second cap you posted has only 16Arms rating which is way too low for MMC use, given the large capacitance
« Last Edit: June 28, 2017, 10:56:09 AM by futurist »

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1046
  • Karma: +16/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: Tardief's DRSSTC
« Reply #8 on: June 28, 2017, 12:50:51 PM »
I agree with Futurist.

CDE 942C is simply too expensive to use in a large DRSSTC as you get either a disproportional voltage rating or current rating to achieve the values needed in a CM600 coil.

That Ducati Energia capacitors looks like a motor run capacitor, I have no experience with using those, but given the voltage/current rating, those are properly not a viable choice as the MMC will get incredible large and expensive.

I have unfortunately not yet finished the MMC chapter of my DRSSTC design guide, it is a rather long and technical chapter to write, but you can see the 4 kinds of snubber capacitors that I would advise you to look for in the snubber capacitor part of the guide: http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/snubber-capacitor/
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Tardief

  • High Voltage Enthusiast
  • *
  • Posts: 33
  • Karma: +0/-0
    • View Profile
Re: Tardief's DRSSTC
« Reply #9 on: June 28, 2017, 01:46:39 PM »
I really appreciate your help.  :)

What do you think about these?

http://www.zez-silko.com/en/products/capacitors-for-igbt-cylindrical-cases
For example the PVDJP 21-5/2 from the table.
2kV AC, 2uF  8 in series and 2 in parallel . That means 16kv 0.5uf. 0.5uF-->~7Ω(45kHz) -->15kV (with 2000A)

http://www.zez-silko.com/en/products/capacitors-for-scr
From here PVDJP 020-8/0,75  5 in series and 3 parallel It gives similar results.

http://www.ebay.com/itm/1PC-12000V-DC-6000V-Ac-0-22UF-MFD-80A-Resonant-Tesla-capacitor-50KHZ-G1007-XH/182177380103?_trksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D41451%26meid%3Df556de277cb943dfa1d7761785c9c6fe%26pid%3D100033%26rk%3D3%26rkt%3D8%26sd%3D272541371882
This look pretty expensive. With this low capacity we would need a bunch of these.

I will ask them for the prices. I am pretty curious.
Irms numbers still not too high.   :-\
 
« Last Edit: June 28, 2017, 02:06:55 PM by Tardief »

Offline futurist

  • Global Moderator
  • High Voltage Technician
  • *****
  • Posts: 116
  • Karma: +0/-0
    • View Profile
Re: Tardief's DRSSTC
« Reply #10 on: June 28, 2017, 05:38:37 PM »
I suggest buying used/NOS caps or you might go bankrupt

Mine are NOS similar to these, 0.68uF 2000V, 25Arms, which allow many different MMC configurations.. and I got them for ~2$ per cap
http://www.ebay.com/itm/1-2uF-MKP-C4AS-1200VDC-HQ-Arcotronics-IGBT-Box-PCB-10-pcs-/182622703100

You can also visit your local scrapyard, maybe they could save something useful

Offline Tardief

  • High Voltage Enthusiast
  • *
  • Posts: 33
  • Karma: +0/-0
    • View Profile
Re: Tardief's DRSSTC
« Reply #11 on: June 30, 2017, 11:36:04 AM »
What capacitance do you suggest for 2000Ipeak at 565Vbus?
And what about the capacitors Irms rating? I cant find any suggestion on the internet.  :-\


Quote
Primary coil conclusion: Hollow copper tubing has the best electrical and mechanical features in regard to primary coil construction. There is very little electrical difference from 10 mm to 25 mm copper tubing compared to the extra physical size.

Mads you wrote this in "Busbar and primary circuit".  That means the 10mm copper tube is enough?
« Last Edit: June 30, 2017, 02:39:58 PM by Tardief »

Offline Hydron

  • Administrator
  • High Voltage Engineer
  • *****
  • Posts: 238
  • Karma: +7/-0
    • View Profile
Re: Tardief's DRSSTC
« Reply #12 on: July 01, 2017, 02:04:42 AM »
As current increases you're better off going for water cooled tubing than very large diameter tube. Smaller diameter is also easier to work with without kinking etc.

As for MMC capacitors:
- Capacitance should be determined by frequency and desired primary impedance. It's probably good to have a look at what people with similar sized coils have found to work well - it's not critical as long as you can adjust the primary coil to match.
- I suggest using the calculator on Mads' website to check what voltage rating is needed once you know your desired capacitance and frequency
- I strongly recommend looking on ebay etc rather than the normal parts suppliers. While Farnell, TME, RS etc can be OK for some stuff (e.g. smaller value capacitors for high frequency coils) much better bargains can be found elsewhere for large MMC caps.
- Often RMS and peak current are not directly stated in datasheets. RMS current can be determined from RMS voltage vs frequency graphs (divide RMS voltage by the capacitor impedance at the desired frequency to get RMS current), while peak current is easily determined from multiplying the dV/dt number (in V/us) by capacitance in uF.
- "Snubber" capacitors often have appropriate characteristics for MMCs if they can be found in appropriate voltage/capacitance values - they normally have good RMS current rating and low loss polypropylene dielectric (this is the only suitable dielectric for medium-large DRSSTC MMC capacitors).

I used 48 of the 2uF/1kV caps shown in the previously linked snubber capacitor guide as my MMC for my larger (~1kA peak, similar size to futurist's) coil, though the 0.68uF capacitors he used would actually be better. They were purchased at $2 USD each from a now closed US surplus dealer, though shipping overseas cost nearly as much as the capacitors.

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1046
  • Karma: +16/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: Tardief's DRSSTC
« Reply #13 on: July 01, 2017, 09:36:47 AM »
I only meant the physical types of polypropylene capacitors when I linked to the snubber capacitor part of the design guide, not just those manufacturers, there are hundreds of useful MKP/metallized film capacitors out there to be used.

As Hydron said, water cooling is the only solution, even 25 mm copper tubing would need water cooling, due to the proximity effect where the outer turns of the primary coil induction heats the inner turns. This is also why you should pump the cooling water in from the inner turn end.

The MMC calculator on my website that Hydron mentions: http://kaizerpowerelectronics.dk/calculators/mmc-calculator/

I would suggest that you use something like 0.75 to 1.5 uF, where 0.75 uF would be a high impedance coil that requires longer on-time but has lower peak current, thus lower peak voltage (cheaper MMC, but may not even be able to run at 2kA due to impedance limitations) 1.5 uF is the opposite, use it for a low impedance coil with higher peak currents, but also needs a more expensive MMC.

The higher capacitance in the MMC, the smaller primary coil is needed to hit the resonant frequency and thus peak current goes up UP UP!

There are many different choices to make and they are often conflicting, depending on each other, are in eachothers equations and thus changes everything once again, that is the reason why I made the MMC calculator as it is, you decide on a primary inductance, frequency and maximum primary current and then design from that.

Here are some of the best offers I could find on ebay, I shopped from Tauritronics myself, I got a lot of those 5uF snubber caps :)

http://www.ebay.co.uk/itm/5uF-1200V-MKP-Filter-Caps-GTO-LOW-ESR-HQ-arcotronics-25pcs-/172721058519?hash=item2836fa32d7:g:GWkAAOSwk5FUz9UQ

http://www.ebay.co.uk/itm/0-68uF-1600VDC-R75-MKP-HQ-Arcotronics-6Pcs-/172733208790?hash=item2837b398d6:g:2fIAAOSwk5FUsRR0

http://www.ebay.co.uk/itm/1-5uF-1000V-MKP-C4BS-HQ-Low-ESR-Arcotronics-IBGT-Tesla-2pcs-/172734282522?hash=item2837c3fb1a:g:jHoAAOSw9IpXzZTZ

http://www.ebay.co.uk/itm/0-47uF-850V-C4BS-Arcotronics-IBGT-MKP-Capacitor-Tesla-30pcs-/182642886321?hash=item2a865d46b1:g:rhMAAOSwSypY~15e

http://www.ebay.co.uk/itm/0-47uF-3000V-1-44-2-Arcotronics-IBGT-MKP-Capacitor-Tesla-12pcs-/172754315379?hash=item2838f5a873:g:IIcAAOSwHHFY~2BL
« Last Edit: July 01, 2017, 01:46:53 PM by Mads Barnkob »
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Uspring

  • High Voltage Technician
  • ***
  • Posts: 105
  • Karma: +8/-0
    • View Profile
Re: Tardief's DRSSTC
« Reply #14 on: July 01, 2017, 07:53:42 PM »
Tardief wrote:
Quote
What capacitance do you suggest for 2000Ipeak at 565Vbus?
The idea is to obtain an impedance match between the inverter and the coil. An approximate rule is:

Vmax/Imax < k  * sqrt(L/C)

Vmax is the effective input voltage. This is 4/pi of the bus voltage. This factor comes from feeding the primary with a square wave instead of a sine wave. Imax is peak primary current, k coupling and L and C primary inductance and capacitance. In effect this inequality specifies, that you shouldn't have to limit burst length in order not to exceed Imax, i.e. that secondary loading will limit primary current. An alternative way to write this equation is:

Vmax/Imax < k  / (2*pi*f*C)

f being the primary resonance frequency.

Solving for C and plugging in your values and a k of 0.2, I get a C of less than 2.2uF.
Using this value, you will probably have a hard time tuning your coil, since the right side of the inequality can become much lower if it is not perfectly tuned. So Mads recommendation is better, since it leaves some leeway in tuning. If you choose C too small you will find, that there won't flow enough current into the primary. But this can be compensated for by detuning. For a given primary current, though, a lower capacitance will be more costly.


Offline Tardief

  • High Voltage Enthusiast
  • *
  • Posts: 33
  • Karma: +0/-0
    • View Profile
Re: Tardief's DRSSTC
« Reply #15 on: July 02, 2017, 11:09:44 AM »
Thanks for everyone!

http://www.ebay.co.uk/itm/5uF-1200V-MKP-Filter-Caps-GTO-LOW-ESR-HQ-arcotronics-25pcs-/172721058519?hash=item2836fa32d7:g:GWkAAOSwk5FUz9UQ
This offer sounds good.
For example in 2*10 binding. And I could change capacitance easily with adding or removing 1 from the string.
The 2 parallel string has only 2*64 Arms. The calculator says i need ~200A.

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1046
  • Karma: +16/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: Tardief's DRSSTC
« Reply #16 on: July 02, 2017, 01:51:35 PM »
I agree on those capacitors being the best choice, both from a ratings and economic perspective.

Irms is "only" a problem over time, so long run times would be ruled out if you do not meet these minimum figures, but with forced air cooling and as I write this I just had an idea on how to cool them even better...

From my DRSSTC guide, there you can read that 2/3 of the dissipated heat in a capacitor is radiated out axially and most through the terminal/leads, so if you made a circular heat sink to mount in between each capacitor that would properly help a lot on cooling them effectively. Just make sure that it wont be a problem insulation wise.

= a capacitor
| a flat aluminium/copper plate or heat sink

=|=|=|=|=
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Tardief

  • High Voltage Enthusiast
  • *
  • Posts: 33
  • Karma: +0/-0
    • View Profile
Re: Tardief's DRSSTC
« Reply #17 on: July 12, 2017, 03:55:55 PM »
We are trying to find a suitable DC Bus capacitor.
For now we have this: http://hu.mouser.com/ProductDetail/KEMET/ALS70A103NP350/?qs=sGAEpiMZZMvwFf0viD3Y3fHxNcSaiftwWEEMtbZ5fvazhnres9Q4%252bQ%3D%3D

According to the datasheet it can handle 26,2A at 10kHz.  Do you think, that 4 of these will be okay? (564Vbus)
And what about the balance resistors? We dont need them if we use brand new capacitors?

I didn't find any recomendation for the pre-charge current. I think a 220ohm 100W resistor is okay.


« Last Edit: July 12, 2017, 03:59:26 PM by Tardief »

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1046
  • Karma: +16/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: Tardief's DRSSTC
« Reply #18 on: July 13, 2017, 09:19:53 AM »
4 of those capacitors, 2 in series, 2 strings in parallel for 10000uF at 700VDC sounds fine, I only have 6000uF in mine, but would certainly like to have more :)

This also gives you 52,4Aripple, as I made the calculations in my DC bus capacitor chapter of the DRSSTC design guide to my large DRSSTC, its almost identical to the calculations you have to do: http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/dc-bus-capacitor/

In order to keep your capacitors in good shape, you should use balance/bleeder resistors, a industry standard that I see in almost every drive/inverter/UPS I take apart is 47K across each capacitor.

I never used a pre-charge circuit, as I always had a variac at hand to ramp up the voltage slowly. 220R / 100 W is more than fine, its just for a few seconds to get the capacitors a little up in charge so that it doesn't look like a huge short circuit to the mains supply. So it is not that critical with the rating, its only going to be on for a few seconds anyway, and then bridge over by a timed relay.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Tardief

  • High Voltage Enthusiast
  • *
  • Posts: 33
  • Karma: +0/-0
    • View Profile
Re: Tardief's DRSSTC
« Reply #19 on: July 15, 2017, 06:14:49 PM »
Thanks! :)

Could you tell me some more about the snubber capacitor on the IGBT?
http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/snubber-capacitor/
Here you asumed that the busbar inductance is 200nH. How should I calculate that?
Do you have some recommendation for the IGBT protection?

High Voltage Forum

Re: Tardief's DRSSTC
« Reply #19 on: July 15, 2017, 06:14:49 PM »

 


* Recent Topics and Posts

post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
Today at 02:51:26 PM
post Re: What is the true in tuning guide?
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
Today at 02:48:02 PM
post Re: A problem solved with hand tools
[General chatting]
Mads Barnkob
Today at 01:48:08 PM
post Re: Kaizer half bridge driver
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
Today at 01:45:00 PM
post Re: A problem solved with hand tools
[General chatting]
Hydron
Today at 11:21:29 AM
post What is the true in tuning guide?
[Dual Resonant Solid State Tesla coils]
VNTC
Today at 10:01:21 AM
post A problem solved with hand tools
[General chatting]
klugesmith
Today at 07:52:41 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
klugesmith
Today at 07:33:30 AM
post Re: tesla coil varnish is dumb
[Solid state Tesla coils]
Hydron
July 14, 2019, 10:49:03 PM
post Re: tesla coil varnish is dumb
[Solid state Tesla coils]
T3sl4co1l
July 14, 2019, 09:59:40 PM
post Re: tesla coil varnish is dumb
[Solid state Tesla coils]
Mads Barnkob
July 14, 2019, 08:20:52 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
July 14, 2019, 06:06:30 PM
post tesla coil varnish is dumb
[Solid state Tesla coils]
Fumeaux
July 14, 2019, 05:29:10 PM
post Led Closeups with Mobile phone and lens .
[Smart phones]
DashApple
July 14, 2019, 03:00:09 PM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 14, 2019, 02:06:26 PM
post Re: DRSSTC in brust mode
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 14, 2019, 02:04:22 PM
post Re: Twin System Build
[Dual Resonant Solid State Tesla coils]
oneKone
July 14, 2019, 01:27:18 AM
post Re: DRSSTC in brust mode
[Dual Resonant Solid State Tesla coils]
johnf
July 14, 2019, 01:22:15 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
oneKone
July 13, 2019, 03:48:54 PM
post DRSSTC in brust mode
[Dual Resonant Solid State Tesla coils]
SAMGO
July 13, 2019, 04:17:55 AM
post Re: Kaizer half bridge driver
[Dual Resonant Solid State Tesla coils]
donnersm
July 12, 2019, 08:54:54 PM
post Re: Kaizer half bridge driver
[Dual Resonant Solid State Tesla coils]
profdc9
July 12, 2019, 07:16:40 PM
post Re: Kaizer half bridge driver
[Dual Resonant Solid State Tesla coils]
profdc9
July 12, 2019, 06:33:00 PM
post Smooth corona or heavy spark, RF wave radiation frequency of Tesla coil drops ve
[Dual Resonant Solid State Tesla coils]
VNTC
July 12, 2019, 11:09:28 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 12, 2019, 09:56:38 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
oneKone
July 12, 2019, 01:23:58 AM
post Re: Completed my pulsed power generator
[Capacitor banks]
MRMILSTAR
July 11, 2019, 05:48:27 PM
post Re: Completed my pulsed power generator
[Capacitor banks]
Mads Barnkob
July 11, 2019, 02:58:13 PM
post Re: Kaizer half bridge driver
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 11, 2019, 02:45:24 PM
post Kaizer half bridge driver
[Dual Resonant Solid State Tesla coils]
donnersm
July 11, 2019, 06:59:01 AM
post Completed my pulsed power generator
[Capacitor banks]
MRMILSTAR
July 11, 2019, 05:43:31 AM
post Re: Twin System Build
[Dual Resonant Solid State Tesla coils]
fnordest
July 11, 2019, 01:05:42 AM
post Re: "LightningStorm" VTTC project
[Vacuum tube Tesla coils]
Avenger
July 09, 2019, 07:31:37 PM
post Re: Siemens Polyphos 30 xray machine
[X-ray]
oneKone
July 09, 2019, 04:48:29 PM
post Re: Siemens Polyphos 30 xray machine
[X-ray]
Mads Barnkob
July 09, 2019, 03:53:37 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Bert911
July 09, 2019, 08:45:17 AM
post DRSSTC schematic for simulating (primary feedback self-oscillating)
[Dual Resonant Solid State Tesla coils]
VNTC
July 09, 2019, 06:10:12 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
July 08, 2019, 09:13:42 PM
post Re: Driving the LED lights with the streamers
[Dual Resonant Solid State Tesla coils]
johnf
July 08, 2019, 09:02:20 PM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
oneKone
July 08, 2019, 03:57:17 PM
post Re: Driving the LED lights with the streamers
[Dual Resonant Solid State Tesla coils]
Fumeaux
July 08, 2019, 12:05:54 PM
post Driving the LED lights with the streamers
[Dual Resonant Solid State Tesla coils]
donnersm
July 08, 2019, 11:04:00 AM
post Re: Aliexpress cheap CM300-24H
[Dual Resonant Solid State Tesla coils]
SAMGO
July 08, 2019, 10:43:33 AM
post Re: Hydron's 160mm DRSSTC and topload current measurements
[Dual Resonant Solid State Tesla coils]
Uspring
July 08, 2019, 09:59:49 AM
post Re: Aliexpress cheap CM300-24H
[Dual Resonant Solid State Tesla coils]
oneKone
July 08, 2019, 08:04:44 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Mads Barnkob
July 07, 2019, 08:19:33 PM
post Re: Twin System Build
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 07, 2019, 08:03:59 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
July 07, 2019, 05:28:04 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
July 07, 2019, 05:24:20 AM
post Re: Induction Heater schematic modification
[Electronic circuits]
johnf
July 07, 2019, 04:53:29 AM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30